Bone plug



FIG. 1 is a front elevation of a bone plug showing my new design;

FIG. 2 is a rear elevation thereof;

FIG. 3 is a right side elevation thereof;

FIG. 4 is a left side elevation thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a top perspective view thereof.

I claim the ornamental design for a bone plug, as shown and described.